Persol 3246 - George Clooney - Ticket To Paradise
These square frame sunglasses wit metal arms are available in several color combinations. Clooney seems to be wearing the model with black frame and steel arms.
Original retail price around $350 but you find these now for anywhere between $140 and $350 (depending on the color):
There's one on JomaShop on sale.
Find on eBay (always a few available)
George Clooney himself is a fan of the Italian Persol brand and can often be spotted wearing Persol sunglasses in movies and his private life.
Complete the look
Clooney also wears an Omega Seamaster Aqua Terra watch in the same film.
Reference: Persol PO3246S 95-31